Физико-химические особенности процесса формирования Карийского золоторудного месторождения (Восточное Забайкальестатья
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Дата последнего поиска статьи во внешних источниках: 9 октября 2015 г.
Аннотация:Detailed cryo- and thermometric studies of fluid and melt inclusions confirmed the genetic links established earlier between the gold mineralization and granitic rocks of the Amudzhikan-Sretenskii Complex. The obtained results made it possible to constrain the boundary physicochemical parameters of the ore-magmatic system. The granitic melt was rich in water (up to 11.3 wt %) and chlorine (up to 0.48 wt %) and crystallized at temperatures of 800-690 degrees C and water pressures of 4.8-4.2 kbar. The conditions under which the hydrothermal ore mineralization formed varied over wide ranges of parameters: temperature 575-85 degrees C, pressure 2820-85 bar, and solution salinity 56-0.5 wt % NaCl equiv., with carbon dioxide playing a significant role in the process. During the initial stages of the hydrothermal activity, the solution boiled off, which resulted in an increase in its salinity and enrichment in ore-forming components. The fluid salinity rapidly decreased at temperatures below 350 degrees C, probably because of the opening of fractures and addition of meteoric waters to the system. These processes brought about massive ore deposition.